Impulse transmitter of the dial type



' E. TANK:

IIPULSE TRANSMITTER 0: THE DIAL rut Filed Nov. 29. 1921 Oct. 13 1925.1,556,974

l n l Ii" [3 II p [7 '-Iuuen ur Erml Tanks UNITED STAT.

Patented Oct. 13, 1925.

s PATENTOF 1,556,974; FICE.

'EMIL 'TANKE, or FALkENnaGr-in B/ SEEGE FELD' KREIS OSTHAVELLAND,GERMANY, ASSIGNOR TO AUTOMATIC ELECTRIC ooMrAnY, or CHICAGO, ILLINOIS, Aconrom'rron or ILLINOIS.

IMrunsE TRANSMITTER-0F 'rnn bIAL TYPE.

Application mednbvember 29, 1921. Serial No. 518,723.

To all whomz't may concern: Be itknown that LEMIL TANKE, a Germancitizen, and resident of Falkenhagen b/Seegefeld Kreis Osthavelland,Germany, have invented certain new and useful Improvements in ImpulseTransmittersofthe Dial Type, of which the following'is a specification.

Thisinvention relates in general to impulse transmitters for automaticor semiautomatic telephone systems more particularly to impulsetransmitters of'the type in which suflicienttime is gained for theoperation of the automatic switches between the transmission of eachseries ofimpulses by the provision of meansfor bridging the im' ulsesprings and thereby rendering a definite number of currentimpulsesinefiective. The means servingfor the'bridging of the impulsespringshas, so far as appli cant is aware, heretofore been influenced bya special axially displaceable spur wheel. I A material simplificationof the known arrangement is provided" accordingto this invention, bycausing the contact serving for bridging the impulse springs to becontrolled by the same member whichis used to influence the contactsserving for controlling the line switching action.

A constructional example of the improved dial switch with the omission,however, of the parts not required for theunderstanding of theinvention, is illustrated in the annexed drawing, in which Figure 1shows a rear view of the dial switch and Figure 2 a detail thereof inlateral view. R'otatably journalled in the base platel is a shaft 2secured to which is the number disc provided with the usrialfingerholes. Arranged,

moreover, on the shaft 2, is a disc 3 provid ed on which are cams 4: and5. Rotatable also on the shaft 2 is a lever 6 the free end of whichcarries a pin and normally is in engagement with a pin 8 secured in theplate 1. The spring 10 has the tendency to draw the lever 6 towards thecam 4. The shaft 2 carries rotatably also a worm gear 11 which isprovided with facial teeth 12. Engaging with these locking teeth 12 is apawl 13 arranged on the plate 1 and adapted to counteract a rotation ofthe worm wheel 11 in the direction of the setting action indicated bythe lower arrow. In the return movement indicated by the upper arrow theworm wheel 11 is rotated from the shaft2 by means i of intermediatemechanism not shownflf- The'worm teeth on the wheel 11 engage with aworm 16 secured on the braking shaft 14; of the centrifugal governor 15.The centrifugal governor 15 serves in a known manner for the regulationof the return movement of the finger hole dial under the in; fluence ofa cocked spring. Intheposition of res t ofthe dial switch thecentrifugal governor 15 is held fast by a'cam 5. v

Secured between the insulating plates 17 mounted on the base Plate 1 isa set of con tact springs. .Thisset comprises the contact springs 18, 19for the impulse contact 20', the contact jsprings121, 22{f0r the contact23 serving for bridging theimpulse contact 20 and the contact springs 21,'25, 26, control ling in a 'known manner the contacts 27 governing theline connections. Asshown in Figure .2, the contact springs 21, 22, areof angular shape so that the contact 23 is situated laterally withregard to the contacts 27. Secured to the governor shaft 141 is thewheel 28 serving forthe opening of the impulse contact 20. Thetransverse pin 7 on the lever 6 in the normal position of the dialswitch acts on the spring 26 to hold the contact 27 open. In the normalpositi'onof the dial switch the contact 23 is closed. l i l Theoperation of thedial switch above do scribed is as follows By theremoval. of the receiver by the subscriber, thefinger hold dial isreleased. The subscriber commences in known manner to rotate the*fingerdial down to a stop. 1 The cam4 on the disc 3 which partakes of therotation of the finger dial, releases the lever 6:30 that the latter,under the action of the spring'lO follows the cam 4.- until the, pin 7of the lever 6 encounters the abutmentt). At the commencement of themovement of the lever 6, the pin 7 releases the contact spring 26whereby the contacts 27 for the line are closed. At the end of themovement of the lever 6 the pin 7 acts against the contact spring 21,thereby opening the contact 23, bridging the impulse contact 20. In addition, the cam 5 on the disc 3 releases the brake 15.

7 Now when the subscriber releases the finger dial, the latter, underthe action of turn motion of the finger dial.

moment in which the finger dial hasimovedf interrupted once so that theimpulses are produced from the commencement of the re- At: the

back so far that the cam 4 on the disc 3 con nected thereto engages andmoves along the lever 6, resting. against the abutment 9, the contactspring 21 is released from the pin 7, and consequently the contact 23 isclosed. As the contact 23 is connected in parallel; with the impulsecontact 20, the interruptions of the impulse contact elfected; during.

the remainder ot the return of the disc 3,

in which the lever 6 is moved; to its initial position, are ineffective.At the end ot the return movement of the lever 6 to the initial;

position, the contacts 27 are opened by the v pin 7 striking againstspring 26: and the position of rest is reestablished.

By combining thecontact springs 18, 19, 21, 22 and:2 l 26 to a set,separate connections between the individual contact springs are,rendered superfluous.

What I claim and desire to, Letters Patent is i l 1. In an impulsesending device, a finger hold dial, impulse springs, springs for shortcircuiting said impulse springs, other springs for short circuiti'ngsubstation apparatus, and a common member controlled by said protectbydial for directly operating both sets of said short circuiting.springs,

2. In an impulse sending device, interrupter springs, a pair of springsfor short circuiting said interrupter springs, other springs, and asingle means for: operating. said: other springs during both the settingand impulse transmittin-g'operation of said device and for operatingsaid short ci,r-

cuiting'springs only during the initial part, of the setting operationand: the final part of the impulse transmitting operation.

3. In an impulse sending device, interrupter springs, a pair of springsfor short circuiting said mterrupter springs, other springs, and asingle means for operating said other springs during both the. settingand impulse transmitting operation of said device and for opening. saidshort circuiting springs. upon the initial part; of the settingoperation and only closing said springs during he ina part 013 th mpulsetran mitng opera ion 4'. In an impnlse sender having forward andbackward movement, means for sending impulses on. the backward movement,contacts closed during the forward and backward movement of the senderand other contacts closed only during a portion of the backward movementto render the. impulse sending means ineffective, and. a single memberfor operating both sets oli contacts.

5. In an impulse transmitting device, interrupter-springs,a pair ofsprings for short oircuitingsaidinterrupter springs, and. means forrendering the said last springs effective during the final of aplurality of operations 0t said; impulse springs.

6. In, an impulse transmitting device, impulse springs, means. foroperating said springs a. plurality of times each time the. device isoperated to transmit one or more impulses, andmeans rendered effectivejust. prior to the final operation of said springs to render such=operation ineffective so. far as the transmission of an impulse is,con-' cerned. In an impulse transmitting device, im'- pulse springs,means for operating said springs a plurality of times each time the.device is operated; to transmit one or more impulses, and. meansrendered efi ective just priorto the final operation of said; springsto. render such operationinefi'ective I Ov ar as the transmission of animpulse. is con,-, cerned,the's,aid means comprising a pair of springsconnected in multiple with said interrupter springs. v

8. In an. impulse transmitting device, impulse springs, a cam forseparating said springs a plurality of times each time the, device. isoperated, and means for maintain-H ingsaid; springs electricallycon'nectedduring their final separation.

9. an impulse transmitter, a finger-hold dial, subscriber controlledmechanism for producing series of interruptions in the line circuit, anautomatiodevice for rendering the last interruption of every, seriesineffective, said device comprising a pair olshunt springs and abelloranklever for operating them, and means controlled by the said dialfor operating said lever.

EMIL TANKE... 1

